ABSTRACT
Utilities typically use engineering standards and the National Electrical Safety Code (NESC) for designing their systems. There are different definitions of medium- and high-voltage, but a general consensus is that medium voltage is over 1000V, and here the people are typically talking about connections that are between 4000 and 500,000V. Typically, field labeling would be having a Nationally Recognized Testing Lab (NRTL), such as UL, TUV, CSA, or Intertek send someone out to approve of the product and give it the lab’s label while it is in the field. When installing a large-scale PV system in the past, PV companies were often forced to pretend that they were a utility. Using Article 690 for compliance with a 100MW power plant was never the intended use of Article 690. Not being able to treat a large solar facility like a large coal, nuclear, or natural gas facility, when it comes to local AHJ and the NEC, was discriminatory against renewable energy.
